JP6272007B2 - Liquid discharge head - Google Patents

Description

The present invention relates to a liquid discharge head capable of discharging a liquid .

  2. Description of the Related Art Conventionally, many recording heads as liquid ejection heads in commonly used ink jet recording apparatuses are manufactured by bonding an orifice plate and a substrate on which a liquid supply port or the like is formed. In this type of recording head, the substrate and the orifice plate are bonded to each other, so that a common liquid chamber is formed in a part of the space between them. A liquid supply port is formed in the substrate so as to penetrate the substrate, and the liquid supply port communicates with the common liquid chamber. The flow path extends in communication with the common liquid chamber, and a pressure chamber is formed at the end of the flow path opposite to the common liquid chamber. The orifice plate has a discharge port that communicates with the pressure chamber. A heater as a discharge energy generating element for supplying discharge energy to the liquid in the pressure chamber is disposed at a position corresponding to the discharge port. The liquid supplied to the common liquid chamber via the liquid supply port is supplied to the pressure chamber via the flow path, and energy is supplied to the liquid by the heater in the pressure chamber, and the liquid is discharged from the discharge port. In the recording head described here, the liquid is supplied from the liquid supply port to the discharge port in only one direction.

  In general, in such a liquid discharge head, discharge port arrays can be arranged only at both ends of the common liquid chamber. If many discharge ports are arranged in a limited area at both ends of the common liquid chamber, restrictions on the shape and size of the flow path and the pressure chamber are large.

  Patent Document 1 discloses a method of thinning a part of a substrate and providing a large number of liquid supply ports in the thin part. That is, in the prior art, since the liquid supply ports over a wide range of the substrate are formed, the discharge ports can be arranged only on both sides of the liquid supply port. However, in Patent Document 1, since a large number of small liquid supply ports are arranged, it is possible to pass wiring for sending electrical energy to the energy generating element between the liquid supply ports. This makes it possible to arrange the pressure chamber, the discharge energy generating element, and the discharge port on the portion where the part of the substrate is thinned. Therefore, the degree of freedom in design of the discharge ports and pressure chambers is increased, and for example, three or more discharge port rows can be arranged.

JP 2010-201926 A

  In order to obtain a high-quality image, it may be advantageous to lengthen the flow path that connects the pressure chamber and the liquid supply port. For example, density unevenness can be suppressed by lengthening the flow path and suppressing diffusion of the concentrated liquid. In addition, by adjusting the flow resistance balance between the front and the rear by making the flow path longer, the liquid can be discharged stably by making the liquid discharge speed appropriate and forming the droplets well. As a result, a high-quality image can be obtained. However, if the flow path is lengthened with the configuration of Patent Document 1, the distance between the pressure chamber and the liquid supply port increases, and when a plurality of discharge port arrays are arranged, the interval between adjacent discharge port arrays increases. As a result, the substrate becomes large.

Therefore, in view of the above circumstances, the present invention can ensure a long flow path length of a flow path communicating with the pressure chamber and the liquid supply port without increasing the size of the substrate, and can obtain a high-quality image. An object is to provide a liquid discharge head .

The liquid discharge head of the present invention includes an energy generation element that applies energy to the liquid, a plurality of pressure chambers that communicate with a discharge port that discharges the liquid to which energy is applied by the energy generation element, and the pressure chamber A liquid supply port for supplying a liquid to the pressure chamber, a pressure channel, and a liquid flow path that is connected between the liquid supply port and guides the liquid from the liquid supply port to the pressure chamber. In the liquid discharge head in which the discharge port array in which the discharge ports are arranged in the first direction and the liquid supply port array in which the plurality of liquid supply ports are arranged are arranged in parallel, the pressure chamber the two of the liquid communicated through two of said liquid supply port and two of said liquid flow path, connected to the pressure chamber, except for said liquid supply port which is disposed closest to the pressure chamber Each of the flow paths has the pressure chamber Characterized in that it is connected at a position facing definitive.

  According to the present invention, it is possible to ensure a long flow path length of a flow path connecting the pressure chamber and the liquid supply port without increasing the size of the substrate. Therefore, when the liquid is thickened and the components contained in the liquid are concentrated, it can be collected before the concentrated liquid diffuses. As a result, density unevenness can be suppressed and a high-quality image can be obtained. In addition, energy generated by driving the printing element can be used efficiently, and energy consumption can be reduced.

1 is a perspective view illustrating an ink jet recording apparatus on which a recording head according to a first embodiment of the present invention is mounted. FIG. 3 is a perspective view illustrating the recording head according to the first embodiment of the invention. FIG. 3 is a plan view showing a surface on which discharge ports are formed in the recording head of FIG. 2. FIG. 3 is a plan view illustrating a state in which three ejection port arrays in the recording head of FIG. 2 are extracted and enlarged, and an orifice plate is removed. FIG. 5 is a cross-sectional view taken along line VV in a state where an orifice plate is attached in the recording head of FIG. 4. FIG. 6 is a plan view illustrating a modification of the recording head in FIG. 4. FIG. 6 is a plan view illustrating a state where three ejection port arrays in a recording head according to a second embodiment of the present invention are extracted and enlarged, and an orifice plate is removed. FIG. 10 is a plan view illustrating a state where three ejection port arrays in a recording head according to a third embodiment of the present invention are extracted and enlarged, and an orifice plate is removed. FIG. 10 is a plan view illustrating a state where three ejection port arrays in a recording head according to a fourth embodiment of the present invention are extracted and enlarged, and an orifice plate is removed. FIG. 10 is a plan view illustrating a state where three ejection port arrays in a recording head according to a fifth embodiment of the present invention are extracted and enlarged, and an orifice plate is removed.

  Hereinafter, an ink jet recording head according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
An ink jet recording head according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an ink jet recording apparatus (liquid ejecting apparatus) 100 on which the ink jet recording head of this embodiment is mounted.

  The inkjet recording apparatus 100 according to the present embodiment includes a carriage 111 on which an inkjet recording head (liquid ejection head) and an ink tank are mounted, and a carriage drive motor 112 that moves the carriage 111 in a scanning manner. In the ink jet recording apparatus 100, when recording is performed, the ink jet recording head 19 shown in FIG. 2 is mounted inside the carriage 111 so as to face the recording medium (medium) in the carriage 111, and is not illustrated. Ink tank is installed.

  The carriage 111 is guided along the guide shaft 106 so as to be movable in the main scanning direction indicated by an arrow A. The guide shaft 106 is disposed so as to extend along the width direction of the recording medium. The ink jet recording head 19 mounted on the carriage 111 performs recording while scanning in a direction intersecting the transport direction in which the recording medium is transported by driving the carriage drive motor 112. As described above, the ink jet recording apparatus 100 is a so-called serial scan type ink jet recording apparatus that records an image with movement of the ink jet recording head 19 in the main scanning direction and conveyance of the recording medium in the sub scanning direction. Ink stored in the ink tank is supplied to the ink jet recording head 19, and recording is performed by discharging the ink supplied to the ink jet recording head 19 toward the recording medium. The ink jet recording head 19 is provided with an energy generating element for ejecting ink droplets. The recording medium is stacked on the paper feed tray 115 and then conveyed in the sub-scanning direction by a conveyance roller.

  Further, the ink jet recording apparatus 100 includes a flexible cable 113 for sending an electric signal from a control unit (not shown) to the ink jet recording head. At the time of recording, an electric signal is transmitted to the energy generating element via the flexible cable 113 at a predetermined timing according to the recording data. In this way, when the current is supplied to the energy generating element, the energy generating element is driven. In the present embodiment, a heating element as an electrothermal conversion element that converts electrical energy into thermal energy is used as the energy generating element. When the heat generating element is driven, film boiling of the ink to which thermal energy is given is caused inside the liquid chamber. As a result, ink is ejected from the ejection opening toward the recording medium, and recording is performed on the recording medium.

  The ink jet recording apparatus 100 includes a recovery processing unit 114 for performing recovery processing of the ink jet recording head. Further, the ink jet recording apparatus 100 includes an optical position sensor 116 that optically reads the position of the carriage 111. Further, the ink jet recording apparatus 100 includes a paper discharge tray 117 that holds a recording medium on which recording has been performed.

  In the inkjet recording apparatus 100 configured as described above, when recording is performed, the carriage 111 is scanned in the main scanning direction orthogonal to the conveyance direction (sub-scanning direction) of the recording medium. As described above, the inkjet recording apparatus 100 repeats the recording operation of ejecting ink while moving the recording head in the main scanning direction and the transporting operation of transporting the recording medium in the sub-scanning direction. Images are recorded in sequence. By moving the carriage 111, the ink jet recording head is moved relative to the recording medium. The inkjet recording head ejects ink droplets from the ejection port to the recording medium while moving relative to the recording medium, and recording is performed with a width corresponding to the range in which the ejection ports are formed. At the time of non-recording, the recording medium is intermittently conveyed by a preset conveyance amount according to the non-recording area of the recording medium.

  In the above embodiment, the ink jet recording head and the ink tank are separately configured. However, the present invention is not limited to this, and the ink jet recording head and the ink tank are integrally configured. May be adopted. The ink tank may be attached to a position different from the carriage 111, and ink may be supplied from the ink tank to the ink jet recording head mounted on the carriage 111 via a tube or the like.

  The above-described recording apparatus is a so-called serial scan type recording apparatus that records an image with movement of the ink jet recording head in the main scanning direction and conveyance of the recording medium in the sub scanning direction. However, the present invention is also applicable to a full-line type recording apparatus that uses a recording head that extends over the entire width of the recording medium. In that case, the ink is supplied from the ink tank toward the ink jet recording head extending over the entire width direction of the recording medium, and the ink is ejected from the ink jet recording head.

  In addition, although the ink jet recording head of the present embodiment employs a system in which film boiling is generated in the ink by a heating element and foamed to eject ink droplets, the present invention is not limited to this. A recording head of a type that deforms the piezoelectric element and thereby discharges liquid inside the ink jet recording head may be applied to the recording apparatus, and another type of ink jet recording head is applied to the recording apparatus of the present invention. Also good.

  FIG. 2 is a perspective view of the ink jet recording head 19. The ink jet recording head 19 is provided with a plurality of ejection port arrays arranged along a direction orthogonal to the scanning direction of the carriage 111. When recording is performed, the ink jet recording head 19 is mounted on the carriage 111.

  FIG. 3 shows a plan view of a recording head 19 as a liquid discharge head mounted on the ink jet recording apparatus. In the present embodiment, the recording head 19 can eject ink of three colors of C (cyan), M (magenta), and Y (yellow). As shown in FIG. 3, the recording head 19 is formed with ejection port array groups C1, M1, Y, M2, and C2 including a plurality of ejection port arrays. The ejection port array groups C1 and C2 are ejection port array groups for cyan ink ejection, each including three ejection port arrays La, Lb, Lc and ejection port arrays Lm, Ln, Lo. The ejection port array groups M1 and M2 are ejection port array groups for ejecting magenta ink, each including three ejection port arrays Ld, Le, Lf and ejection port arrays Lj, Lk, Ll. The ejection port array group Y is an ejection port array group for discharging yellow ink, and includes three ejection port arrays Lg, Lh, and Li. Thus, the recording head 19 has a plurality of ejection port arrays.

  FIG. 4 is an enlarged plan view showing a state in which the ejection port arrays Ld, Le, and Lf in the recording head 19 of FIG. 3 are extracted and the orifice plate 3 is removed.

  FIG. 5 is a cross-sectional view taken along the line VV in FIG. The recording head 19 is formed by mounting the substrate 2 on a support member (not shown) and mounting the flow path forming member 5 and the orifice plate 3 on the substrate 2. A common liquid chamber 4 is defined between the support member and the substrate 2. Further, between the substrate 2 and the orifice plate 3, a liquid chamber 11, a channel 8, and a pressure chamber 9 are defined in a space formed by the channel forming member 5. The substrate 2, the orifice plate 3, and the flow path forming member 5 are formed so as to be common to all the ejection port arrays so that all the ejection port arrays in the recording head 19 are arranged on one member. Yes.

  The pressure chamber 9 can store ink as a liquid therein, and includes a heating element 6 as an energy generating element that applies thermal energy to the stored ink. The pressure chamber 9 is formed with an ejection port for ejecting ink by foaming in the pressure chamber 9 as a result of thermal energy being applied to the ink by driving the heating element 6. Further, the liquid supply port 10 is formed so as to circulate ink from the common liquid chamber 4 in order to supply the liquid to the pressure chamber 9. The liquid chamber 11 is formed at a position corresponding to the liquid supply port 10. Here, the liquid chamber 11 is formed at a position in contact with the liquid supply port 10 along the direction in which the ink is ejected. Therefore, the liquid chamber 11 is formed so that the ink supplied to the pressure chamber 9 after passing through the liquid supply port 10 can be temporarily stored. Also, a plurality of pressure chambers 9 are arranged along the arrangement direction (first direction) Y of the discharge port arrays, and a plurality of discharge ports are arranged along the arrangement direction Y of the discharge port arrays, so that the discharge port arrays Is formed.

  In FIG. 3, a common liquid chamber 4 is formed between a support member (not shown) that supports the substrate and the substrate 2, and is formed in common for a plurality of discharge port arrays for each color. Further, a liquid supply port 10 is formed in the substrate 2 so as to communicate with the common liquid chamber 4 and penetrate the substrate 2. A liquid chamber 11 is formed above the liquid supply port 10 so as to communicate with the ink supply port 10. Between the liquid chamber 11 and the pressure chamber 9, a flow path 8 for flowing ink between the liquid chamber 11 and the pressure chamber 9 is formed so as to communicate with the liquid chamber 11. Further, a pressure chamber 9 is formed so as to be connected to each flow path 8 so as to be sandwiched between the two flow paths 8. A discharge port 7 is formed in the pressure chamber 9 so that the space inside the pressure chamber 9 communicates with the outside of the recording head 19. Further, the heating element 6 is disposed in the pressure chamber 9 at a position facing the discharge port 7.

  Here, the liquid chamber 11 and the flow path 8 are connected at a position between the pressure chamber 9 and the liquid supply port 10, and function as a liquid flow path that guides ink from the liquid supply port 10 to the pressure chamber 9. . That is, the liquid chamber 11 functions as a part of the liquid flow path formed between the liquid supply port 10 and the pressure chamber 9.

  When ink is supplied to the recording head 19, ink is supplied to the common liquid chamber 4 from a corresponding ink tank (not shown). The ink supplied from the ink tank to the common liquid chamber 4 and temporarily stored is supplied to the liquid chamber 11 through a plurality of liquid supply ports 10 penetrating the substrate 2. The ink supplied to the liquid chamber 11 is supplied to the pressure chamber 9 through the flow path 8. Since the pressure chamber 9 is connected by two flow paths 8 at two positions facing each other so as to sandwich the pressure chamber 9, ink is supplied to the pressure chamber 9 from each flow path 8 in a balanced manner. Is done. At this time, ink is supplied from both of the opposing positions, so that the ink flow is less likely to be biased inside the pressure chamber 9 and stable ink ejection can be performed.

  As shown in FIG. 4, the substrate 2 is provided with a plurality of heating elements 6 in a row, and discharge ports 7 are formed at positions facing the heating elements 6 in the orifice plate 3.

  In FIG. 4, a heating element array composed of a plurality of heating elements 6 is arranged along each discharge port array. In each heating element row, each heating element 6 is pitched along a direction (second direction) X that intersects (or intersects in the present embodiment) the ejection port row arrangement direction Y between adjacent heating element rows. The interval is Px (1/300 inch). Further, the heating elements 6 in the heating element array are arranged at intervals of a pitch Py (1/300 inch) along the arrangement direction of the discharge port arrays. Further, when the positions of the corresponding heat generating elements 6 are compared with each other between the adjacent heat generating element arrays, they are arranged with a pitch Py ′ (1/1200 inch) shifted along the arrangement direction Y of the discharge port arrays. In the present embodiment, the respective ejection port arrays are arranged so as to be shifted by a half of the interval pitch Py where the ejection ports are arranged in the respective ejection port arrays between the adjacent ejection port arrays. As described above, since the ejection ports and the heat generating elements are arranged so as to be shifted by a half of the pitch Py between the adjacent ejection port arrays, the resolution is improved in recording by ejecting ink from the recording head. be able to. Therefore, the quality of a recorded image obtained by recording can be improved.

  In the present embodiment, the two flow paths 8 connected to one pressure chamber 9 have different lengths. For example, when the lengths of the two flow paths 8a and 8b connected to the pressure chamber 9a shown in FIG. 4 are compared, the flow path 8b is formed longer than the flow path 8a. Note that the two flow paths 8 connected to one pressure chamber 9 may be formed to have the same length.

  Each discharge port 7 provided at the position of the orifice plate 3 facing each heat generating element 6 is arranged at the same pitch with respect to the heat generating element 6 and Px, Py, Py ′.

  A plurality of liquid supply ports 10 are arranged in a direction substantially perpendicular to the discharge port array direction with respect to the plurality of discharge port arrays, and a plurality of liquid supply ports 10 are arranged so as to sandwich each of the discharge port arrays. A liquid supply port array constituted by the liquid supply ports 10 is arranged. The discharge port array and the liquid supply port array are arranged in parallel.

  In the present embodiment, the pressure chambers 9 and the liquid chambers 11 are alternately arranged on a straight line. The direction in which the pressure chamber 9 and the liquid chamber 11 are arranged is inclined with respect to the direction in which the discharge port arrays are arranged. In the present embodiment, the angles inclined with respect to the arrangement direction Y of the ejection port arrays among the plurality of flow paths 8 connected to the respective pressure chambers 9 are equal between the respective flow paths 8, and the recording head 19. Inside, all the flow paths 8 are arranged in parallel. In each pressure chamber 9, the flow path 8 connected to the pressure chamber 9 is connected to a position facing the pressure chamber 9. Further, in the liquid chamber 11 other than the liquid chamber 11 formed at the end in the direction X orthogonal to the arrangement direction Y of the discharge port array, each flow path 8 connected to the liquid chamber 11 is in the liquid chamber 11. Connected at opposite positions.

  Further, the pressure chamber 9 and the liquid chamber 11 are arranged so that the direction in which the pressure chambers 9 and the liquid chambers 11 are arranged is not a direction orthogonal to the arrangement direction of the discharge port arrays, but extends in a direction oblique to the arrangement direction Y of the discharge port rows. A chamber 9 and a liquid chamber 11 are arranged. Therefore, a liquid flow path that guides ink from the liquid supply port 10 including the flow path 8 and the liquid chamber 11 connected to the pressure chamber 9 to the pressure chamber 9 along the surface on which the discharge port array is formed is a discharge port. It extends in an oblique direction with respect to the arrangement direction Y of the columns. The flow path 8 connected to the pressure chamber 9 extends in an oblique direction with respect to the arrangement direction Y of the discharge port arrays. As shown in FIG. 4, in the present embodiment, the flow path 8 extends in a direction inclined by an angle α with respect to the arrangement direction Y of the discharge port arrays. Here, the flow path 8 extends in an oblique direction with respect to the arrangement direction Y of the discharge port arrays. The flow path 8 is not orthogonal to the arrangement direction Y of the discharge port arrays and is other than 90 degrees. It means that it has an angle and intersects with the arrangement direction Y of the ejection port array. Since the pressure chamber 9 and the liquid chamber 11 are arranged in this way, the pressure chamber 9 is maintained while maintaining a short distance between the liquid chamber 11 and the pressure chamber 9 along the direction X orthogonal to the arrangement direction Y of the discharge port array. The length of the flow path 8 between the liquid chamber 11 and the liquid chamber 11 can be increased.

  Since the length of the flow path 8 can be increased, the ink around the discharge port in the pressure chamber 9 is thickened, the components contained in the ink are concentrated, and concentrated ink having a locally high concentration is generated. Sometimes, the concentrated ink can be prevented from entering the liquid chamber 11 and the liquid supply port 10. Since the distance between the pressure chamber 9 and the liquid chamber 11 or the liquid supply port 10 is long, it takes time to reach the liquid chamber 11 or the liquid supply port 10 when concentrated ink is generated. For this reason, the concentrated ink existing in the pressure chamber 9 is discharged outside the recording head by discharging ink around the discharge port by ink discharge or recovery processing before being diffused to the liquid chamber 11 or the liquid supply port 10. It becomes easy. Accordingly, the thickened and concentrated ink can be easily collected, and the discharge of the concentrated ink can be suppressed when the ink is discharged for recording. It is possible to suppress the occurrence of density unevenness in the recorded image due to the ejection of the concentrated ink when the ink is ejected, and the quality of the recorded image can be improved.

  Moreover, since the length of the flow path 8 can be increased, the flow resistance of the ink flowing through the flow path 8 can be increased. Since the flow resistance inside the flow path 8 is large, when bubbles are generated and the pressure inside the pressure chamber 9 rises, the ink inside the flow path 8 is difficult to move, and the increase in pressure inside the pressure chamber 9 causes the ink to rise. Efficiently used for discharge. Therefore, since the electric energy applied to the heating element 6 is efficiently used for ink ejection, the amount of power applied to the heating element 6 can be reduced, and the power consumption in the ink jet recording apparatus can be reduced. .

  Alternatively, the flow path 8 may be formed short to reduce the flow resistance of the ink flowing through the flow path 8. The length of the flow path can be adjusted to adjust the resistance of the flow path by forming the flow path 8 by inclining the extending direction of the flow path 8 with respect to the direction in which the discharge port arrays are arranged. The design range of the recording head 19 can be increased.

  In the present embodiment, the flow path 8 is formed so as to extend in an oblique direction with respect to the arrangement direction Y of the discharge port arrays, so that the pressure chamber 9 is inclined with respect to the arrangement direction of the discharge port arrays. A space along an oblique direction is effectively used. Since the space in the recording head 19 is used efficiently, the density at which the discharge ports 7 are arranged can be increased, and the recording head 19 can be reduced in size.

  In the present embodiment, the plurality of flow paths 8 formed in the recording head 19 are arranged in a straight line and are arranged in parallel. Therefore, the part of the partition between each flow path 8 is also arrange | positioned in parallel. Therefore, in the manufacturing process of the recording head 19, when the photosensitive resin such as a resist is applied to the substrate 2 to form the orifice plate 3, a portion that becomes a stagnation is hardly generated in the flow of the photosensitive resin. Thereby, the photosensitive resin can smoothly flow between the portions that become the flow paths 8, and the photosensitive resin can be easily spread to a predetermined region. Since the flow of the photosensitive resin can be made smooth, the orifice plate 3 can be formed with high accuracy.

  In the present embodiment, the two flow paths 8 are opposed to the liquid chambers 11 other than the liquid chambers 11 arranged at the end portions along the direction X orthogonal to the arrangement direction Y of the discharge port arrays. Connected in position. Since each flow path 8 communicates with the liquid chamber 11 at a symmetrical position, the ink flow is less likely to stagnate inside the liquid supply port 10 and the liquid chamber 11. Therefore, even if bubbles remain inside the liquid supply port 10 or the liquid chamber 11, the bubbles can be easily discharged from the discharge port to the outside by discharging ink or forcibly discharging ink by the recovery process. . Since bubbles can be easily discharged when bubbles are generated in the liquid chamber 11 or the liquid supply port 10, it is possible to suppress driving the heating element 6 while the bubbles remain inside the pressure chamber 9. it can. If the heating element 6 is driven with bubbles remaining inside the pressure chamber 9, the bubble generated by the driving of the heating element 6 is affected by the remaining bubbles, and the bubbles are biased. And the accuracy of ink ejection may be reduced.

  In the present embodiment, the discharge ports formed in the two pressure chambers 9 connected to one liquid supply port 10 constitute separate discharge port arrays. When an excessive flow rate change occurs in one liquid supply port 10 (for example, 10b) due to clogging of dust or defective opening of the liquid supply port 10 itself, the liquid supply port 10b and the channels 8b and 8c The pressure chambers 9a and 9b communicated with each other are relatively separated from each other. Since each of the discharge ports formed in the pressure chambers 9a and 9b constitutes a discharge port of a different discharge port array, each discharge port is displaced in the X direction of FIG. 4 and the flow path 8 is inclined. Since it extends, each discharge port is also shifted in the Y direction of FIG. As described above, since the ejection ports to which ink is supplied from the same liquid supply port 10 are relatively separated from each other, even if a large change occurs in a certain liquid supply port 10, the ink ejection is affected by this. The discharge outlets that receive are separated. Since the affected ejection ports are separated from each other, even if the accuracy of ink ejection from each of these ejection ports is reduced, the effect on the recorded image is less likely to be visually recognized. It can be kept low.

  If the direction in which the pressure chamber 9 and the liquid chamber 11 are arranged is a direction orthogonal to the arrangement direction of the discharge port arrays, the pressure chamber 9 and the liquid chamber 11 are used to reduce the size of the recording head 19. When the distance between is reduced, the flow path 8 between the pressure chamber 9 and the liquid chamber 11 is shortened accordingly. When the flow path 8 is short, the resistance to the ink flow when ink is supplied from the liquid chamber 11 to the pressure chamber 9 is small, so that when the bubbles are generated by driving the heating element 6, the flow path 8 The amount of ink returning toward the liquid chamber 11 is large. For this reason, the pressure inside the pressure chamber 9 that has risen due to the generation of bubbles escapes, and the electric energy applied to drive the heating element 6 may not be used effectively for ink ejection. For this reason, a large amount of power is used for ink ejection, which increases power consumption during ink ejection and may increase the operating cost of the ink jet recording apparatus. Further, when it is desired to secure the length of the flow path 8, a space for the flow path 8 is newly required, and the recording head may be increased in size. Two pressure chambers 9 connected to one liquid supply port 10 are arranged adjacent to each other in the X direction. Therefore, when a change occurs in the flow rate of a certain liquid supply port 10, the discharge port affected by the change is formed at a relatively close position. For this reason, the influence on the recorded image can be easily recognized, and the influence on the recorded image can be increased.

  As shown in FIG. 4, in the present embodiment, each discharge port array is arranged so that the pitch shift between adjacent discharge port arrays is Py ′. It is not limited to this. The respective ejection port arrays may be arranged so that there is no pitch shift (Py ′ = 0) between the adjacent ejection port arrays.

  Further, in this embodiment, the shape of the pressure chamber 9 viewed along the direction in which ink is ejected is formed in a rectangular shape, but the present invention is not limited to this. As shown in FIG. 6, a pressure chamber having a shape in which corners are gently formed may be formed at a portion other than the position where the flow path 8 is connected to the pressure chamber. By forming the pressure chamber in this manner, the flow of ink becomes smooth, and it is possible to prevent bubbles from remaining inside the pressure chamber after the bubbles are generated for ink ejection. Since air bubbles are prevented from remaining inside the pressure chamber after ink is ejected, it is possible to suppress ink ejection from being affected by the remaining air bubbles. Thereby, it is possible to suppress the ink landing accuracy from being lowered, and to prevent the quality of the recorded image from being lowered. Thus, the pressure chamber 9 may be formed so that at least a part of the wall surface to be defined is a curved surface so that the bubbles can be easily discharged.

  Further, the number of the flow paths 8 connected to the pressure chamber 9 is not limited, and one or two or more flow paths 8 are possible.

(Second Embodiment)
Next, a recording head according to a second embodiment of the invention will be described with reference to the drawings. The same parts as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the recording head according to the first embodiment, the mode in which the two flow paths 8 connected to the pressure chamber 9 are connected to the positions facing each other in the pressure chamber has been described. On the other hand, 2nd Embodiment demonstrates the form by which two flow paths connected to the pressure chamber 9 are connected only to one side regarding the arrangement direction Y of the discharge port row | line | column in the pressure chamber 9. FIG.

  FIG. 7 is a plan view showing a state in which the orifice plate 3 is removed in the recording head 19 ′ according to the second embodiment. FIG. 7 is an enlarged view of the discharge port arrays corresponding to the discharge port arrays Ld, Le, and Lf shown in FIG. The configuration of the recording head of the second embodiment is the same as that of the first embodiment except for the configuration of the pressure chamber 9, the liquid chamber 11, the liquid supply port 10, and the flow path 8.

  In the second embodiment, two flow paths 8 are connected to the pressure chamber 9, and the pressure chamber 9 and the flow path are formed so that these flow paths 8 intersect at the pressure chamber 9 and the angle formed there is an acute angle. 8 is configured. That is, the two liquid flow paths 8 connected to the pressure chamber 9 intersect so that the angle formed between the liquid flow paths becomes an acute angle. In the present embodiment, two flow paths 8 are connected to the end portion on one side along the Y direction, which is the arrangement direction of the discharge port arrays. In addition, each flow path 8 is connected to both outer ends along the X direction orthogonal to the arrangement direction of the discharge port arrays in each pressure chamber 9.

  Further, in the present embodiment, except for the liquid chamber 11 formed at the end along the X direction, the two flow paths 8 are also connected in the liquid chamber 11, and these flow paths 8 are the liquid chamber 11. Crossed. In addition, each flow path 8 is connected to the liquid chamber 11 so that the angle formed by each flow path 8 is an acute angle.

  Similarly to the first embodiment, the flow path 8 connected to the pressure chamber 9 extends in a direction oblique to the arrangement direction of the discharge port arrays along the surface on which the discharge port arrays are formed. . Further, the three ejection port arrays Ld, Le, and Lf are shifted by Py ′ that is half the pitch Py in the ejection port array between the respective ejection port arrays. Of the two flow paths 8 connected to the pressure chamber 9, one flow path is formed relatively long and the other flow path is formed relatively short. For example, for the flow paths 8d and 8e connected to the pressure chamber 9c, the flow path 8d is formed longer than the flow path 8e.

  Since the pressure chamber 9, the liquid chamber 11, and the flow path 8 are thus formed, the length of the flow path 8 can be increased without changing the length along the X direction in the recording head 19 '. Since the length of the flow path 8 can be increased, when the ink around the discharge port in the pressure chamber 9 is thickened and the components contained in the ink are concentrated, the concentrated ink is transferred to the liquid chamber 11 or Before diffusing into the liquid supply port 10, it can be easily discharged out of the recording head. Accordingly, it is possible to suppress the occurrence of density unevenness in the recorded image due to the ejection of the concentrated ink when the ink is ejected, and the quality of the recorded image can be improved.

  Further, by increasing the length of the flow path 8, the ink flow resistance in the flow path 8 can be increased, and the efficiency of ink discharge from the discharge port 7 can be improved. Further, since the length of the flow path 8 can be increased, the length of the flow path 8 can be adjusted in order to adjust the resistance of the flow path 8, and the width in the design of the recording head 19 ′ can be increased. Can do.

  Further, according to the configuration of the present embodiment, the pressure chambers 9 and the liquid chambers 11 are alternately arranged, and the pressure chambers 9 and the liquid chambers 11 are connected by the flow path 8. The flow path 8 is bent. Further, the flow path 8 bent in the pressure chamber 9 or the liquid chamber 11 has an acute angle between the flow paths 8. Thus, in the configuration of the present embodiment, the flow path 8 connected by the pressure chamber 9 and the liquid chamber 11 is bent at the pressure chamber 9 and the liquid chamber 11. Since the pressure chambers 9 do not communicate with each other through a straight flow path, the propagation of the pressure wave generated when ink is ejected in a certain pressure chamber 9 is blocked when the flow path is bent. Therefore, a pressure wave generated in a certain pressure chamber 9 is difficult to propagate to other pressure chambers 9. This suppresses the occurrence of so-called crosstalk in which a pressure wave generated in a certain pressure chamber 9 is transmitted to another pressure chamber 9, so that the ejection of ink in the other pressure chamber 9 is affected by the pressure wave. Therefore, it is possible to discharge ink stably as a whole. Accordingly, the ink landing accuracy can be improved, and the quality of the recorded image can be improved.

  In the present embodiment, since the two flow paths 8 are connected to each pressure chamber 9 at an acute angle, the ink is refilled into the pressure chamber 9 after ink discharge (hereinafter referred to as “refill”). In other words, a vortex caused by ink is generated in the pressure chamber 9. As a result, the defoaming positions of the bubbles generated for ink ejection are dispersed inside the pressure chamber 9, and the occurrence of cavitation occurring when the bubbles are defoamed can be prevented from being concentrated in one place. . Thereby, it is possible to suppress the life of the heating element 6 from being affected by the concentration of cavitation, and the durability of the recording apparatus can be improved.

  Further, in the present embodiment, the position of the discharge ports 7 between adjacent discharge port rows is the pitch Py that is the interval between the discharge ports 7 in the discharge port rows along the arrangement direction Y of the discharge port rows. Although the shift is made by half Py ′, the present invention is not limited to this. There may be no displacement Py 'in the position of the discharge port 7 between the adjacent discharge port rows (Py' = 0) between the adjacent discharge port rows. Further, in order to smoothly discharge bubbles from the pressure chamber 9, the shape of the pressure chamber 9 may be formed such that corners are gently formed at portions other than the position where the flow path 8 is connected to the pressure chamber 9.

  Further, the number of the flow paths 8 connected to the pressure chamber 9 is not limited, and one or two or more flow paths 8 are possible.

(Third embodiment)
Next, a recording head according to a third embodiment of the invention will be described with reference to the drawings. The same parts as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the recording head 19 ″ of the third embodiment, every other pressure chamber 9 corresponding to the ejection port 7 in the same ejection port array is connected via the liquid chamber 11 and the flow path 8. In addition, the angle between the flow paths 8 connected to the pressure chamber 9 intersects with an obtuse angle, which is different from the recording head of the first embodiment and the second embodiment.

  FIG. 8 is a plan view of the recording head 19 ″ according to the third embodiment of the present invention with the orifice plate 3 removed. FIG. 8 is a plan view showing a state where the orifice plate 3 is removed from the recording head 19 ″ according to the third embodiment. FIG. 8 is an enlarged view of the discharge port arrays corresponding to the discharge port arrays Ld, Le, and Lf shown in FIG. The configuration of the recording head 19 ″ of the third embodiment is the same as that of the first embodiment except for the configuration of the pressure chamber 9, the liquid chamber 11, the liquid supply port 10, and the flow path 8.

  Also in the third embodiment, the flow path 8 connected to the pressure chamber 9 extends in a direction oblique to the arrangement direction of the discharge port arrays along the surface on which the discharge port arrays are formed. Further, in the third embodiment, between every other pressure chamber 9 in the discharge port array arranged along the arrangement direction Y and every other pressure chamber 9 along the arrangement direction Y. The arranged liquid chamber 11 is continuously connected. Further, two flow paths 8 are connected to one pressure chamber 9. In the present embodiment, the recording head 19 ″ is formed so that the angle formed by the two flow paths 8 connected to the pressure chamber 9 becomes an obtuse angle. In the present embodiment, the connection position of the flow path 8 to the pressure chamber 9 is only one end portion in the direction X orthogonal to the arrangement direction Y of the discharge port arrays. Therefore, the two flow paths 8 connected to one end portion in the direction X orthogonal to the arrangement direction Y of the discharge port arrays in the pressure chamber 9 are formed continuously and bent by the pressure chamber 9 and the liquid chamber 11. Yes.

  Since the recording head 19 ″ is formed in this way, the length of the flow path 8 can be increased without significantly changing the length of the recording head 19 ″ along the X direction. As a result, the ink flow resistance in the flow path 8 can be increased, the efficiency of ink ejection from the ejection port 7 can be improved, and the increase in size of the recording head 19 ″ can be suppressed. Further, since the length of the flow path 8 can be increased, the length of the flow path 8 can be adjusted in order to adjust the resistance of the flow path 8, and the width in the design of the recording head 19 '' is increased. be able to. Further, since the length of the flow path 8 can be increased, when the ink around the discharge port 7 is thickened and the components contained in the ink are concentrated, the concentrated ink is supplied to the liquid chamber 11 or the liquid supply. Before diffusing into the mouth 10, it can be easily discharged outside the recording head 19 ''. Accordingly, it is possible to suppress the occurrence of density unevenness in the recorded image due to the ejection of the concentrated ink when the ink is ejected, and the quality of the recorded image can be improved.

  In the present embodiment, the connection positions connected to the pressure chambers 9 do not face each other, and the flow path 8 and the pressure chambers 9 are only on one side along the X direction orthogonal to the arrangement direction Y of the discharge port arrays. Are connected, a vortex is generated in the flow of ink supplied to the pressure chamber 9. Therefore, it is possible to disperse the bubble defoaming positions inside the pressure chamber 9, and to reduce the load on the heating element 6 due to cavitation. Thereby, the durability of the recording head 19 ″ can be improved.

  Further, the flow path 8 connected to the pressure chamber 9 is formed to bend at the liquid chamber 11 portion. For this reason, since the continuously formed flow path 8 is bent at the liquid chamber 11, it is possible to suppress the propagation of the pressure wave generated in one pressure chamber 9 to the other pressure chamber 9. it can. The pressure wave can be suppressed from affecting the ejection of ink from the other pressure chambers 9, and the quality of the recorded image can be improved.

  In the present embodiment, among the pressure chambers corresponding to the ejection ports arranged in the ejection port array, every other pressure chamber 9 is connected by a flow channel to form an ink flow channel. Therefore, the pressure chambers 9 connected to one liquid supply port 10 via the flow path 8 are relatively separated from each other. Accordingly, if one liquid supply port 10 is excessively changed in flow rate due to dust clogging or the like, the discharge ports 7 that are affected by the discharge are relatively separated from each other. When a large change occurs in the flow rate of one liquid supply port 10, the affected discharge ports 7 are not concentrated in one place, so the influence of the changed liquid supply port 10 is recorded. It is difficult to see with the image. For this reason, even if a large change occurs in one liquid supply port 10, it is possible to suppress the influence on the recorded image.

  Further, in the present embodiment, the position of the discharge port between the adjacent discharge port rows is only Py ′, which is half the Py of the pitch of the discharge ports in the discharge port row, along the arrangement direction Y of the discharge port rows. However, the present invention is not limited to this. Between adjacent discharge port arrays, the displacement Py ′ of the position of the discharge ports between the respective discharge port arrays may be no pitch shift (Py ′ = 0). Further, in order to smoothly discharge bubbles from the pressure chamber 9, the shape of the pressure chamber may be such that corners are gently formed in portions other than the position where the flow path 8 is connected to the pressure chamber.

  Further, the number of the flow paths 8 connected to the pressure chamber 9 is not limited, and one or two or more flow paths 8 are possible.

(Fourth embodiment)
Next, a recording head according to a fourth embodiment of the invention will be described with reference to the drawings. The same parts as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 9 is a plan view of the recording head 19 ″ ″ according to the fourth embodiment of the present invention with the orifice plate 3 removed. In the recording head 19 ″ ″ of the fourth embodiment, the two flow paths 8 are connected to the pressure chamber 9, and the two flow paths 8 are connected to positions facing each other in the pressure chamber 9. These flow paths 8 are arranged symmetrically across the pressure chamber 9. Further, in the pressure chamber 9, the ink flow path is not bent, and the ink flow path is formed in a straight line. Also in the liquid chamber 11, two flow paths 8 for supplying ink to the pressure chamber 9 are connected. These two flow paths 8 are connected to only one side in the arrangement direction Y of the discharge port array in the liquid chamber 11. The two flow paths 8 connected to the liquid chamber 11 are connected to the liquid chamber so that each formed angle forms an acute angle.

  FIG. 9 is an enlarged view of the discharge port arrays corresponding to the discharge port arrays Ld, Le, and Lf shown in FIG. The configuration of the recording head 19 ″ ″ of the fourth embodiment is the same as that of the first embodiment except for the configuration of the pressure chamber 9, the liquid chamber 11, the liquid supply port 10, and the flow path 8. Also in the fourth embodiment, the flow path 8 connected to the pressure chamber 9 extends in a direction oblique to the arrangement direction of the discharge port arrays along the surface on which the discharge port arrays are formed.

  Since the recording head 19 ″ ″ is formed in this manner, the length of the flow path 8 can be increased without changing the length along the X direction in the recording head 19 ″ ″. As a result, the ink flow resistance in the flow path 8 can be increased, the efficiency of ink discharge from the discharge port 7 can be improved, and the increase in size of the recording head 19 ′ ″ can be suppressed. . Further, since the length of the flow path 8 can be increased, the length of the flow path 8 can be adjusted in order to adjust the resistance of the flow path 8, and the width in the design of the recording head 19 ′ ″ can be increased. Can be spread. Further, since the length of the flow path 8 can be increased, when the ink around the discharge port 7 is thickened and the components contained in the ink are concentrated, the concentrated ink is supplied to the liquid chamber 11 or the liquid supply. Before diffusing to the mouth 10, it can be easily discharged outside the recording head 19 ′ ″. Accordingly, it is possible to suppress the occurrence of density unevenness in the recorded image due to the ejection of the concentrated ink when the ink is ejected, and the quality of the recorded image can be improved.

  Moreover, in this embodiment, the two flow paths 8 connected to the pressure chamber 9 are connected to positions facing each other, and the flow paths 8 are arranged symmetrically across the pressure chamber 9. Accordingly, when ink is supplied from the adjacent liquid supply port 10 to the pressure chamber 9, the ink is supplied in a balanced manner from the respective flow paths 8, so that bubbles are generated inside the pressure chamber 9 for ink discharge. When producing | generating, it can suppress that a bubble is produced | generated unevenly. Since the ink is ejected without the air bubbles being biased, the landing accuracy can be improved and the quality of the recorded image can be improved when the ink is ejected.

  Further, the recording head 19 ″ ″ according to the present embodiment is formed so that the flow path 8 is bent at the liquid chamber 11 portion and does not become a straight line. For this reason, it is possible to suppress the occurrence of so-called crosstalk in which a pressure wave generated when ink is ejected in a certain pressure chamber 9 is propagated to other pressure chambers. Accordingly, it is possible to suppress the ink ejection from the other pressure chambers 9 from being influenced by the pressure wave generated in a certain pressure chamber 9, and the quality of the recorded image can be improved.

  Further, in the present embodiment, the position of the discharge port is shifted by Py ′, which is half the pitch Py of the discharge port in the discharge port row, along the arrangement direction Y of the discharge port row between the adjacent discharge port rows. However, the present invention is not limited to this. Between adjacent discharge port arrays, the displacement Py ′ of the position of the discharge ports between the respective discharge port arrays may be no pitch shift (Py ′ = 0). Further, in order to smoothly discharge bubbles from the pressure chamber 9, the shape of the pressure chamber 9 may be formed such that corners are gently formed at portions other than the position where the flow path 8 is connected to the pressure chamber 9.

  Further, the number of the flow paths 8 connected to the pressure chamber 9 is not limited, and one or two or more flow paths 8 are possible.

(Fifth embodiment)
Next, a recording head according to a fifth embodiment of the invention will be described with reference to the drawings. The same parts as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 10 is a plan view showing a state in which the orifice plate 3 is removed from the recording head 19 ″ ″ ″ according to the fifth embodiment of the present invention. In the recording head 19 ″ ″ of the fifth embodiment, the ejection ports 7 constituting each ejection port array are arranged along the ejection port 7 constituting another ejection port array along the arrangement direction Y of the ejection port rows. Arranged at the same position. Accordingly, when only the positions of the ejection ports 7 are compared between the respective ejection port arrays, the respective ejection port arrays are arranged so that there is no pitch shift (Py ′ = 0). Further, when the positions of the two ejection ports 7 adjacent to the same liquid supply port 10 are compared, the positions are shifted in the arrangement direction Y of the ejection port array by one pitch. The recording head 19 ″ ″ ″ of the fifth embodiment is different from the recording head of the above embodiment in that the ejection ports 7 constituting each ejection port array are arranged in this way.

  FIG. 10 is an enlarged view of the discharge port arrays corresponding to the discharge port arrays Ld, Le, and Lf shown in FIG. The configuration of the recording head 19 ″ ″ ″ of the fifth embodiment is the same as the configuration of the first embodiment except for the configuration of the pressure chamber 9, the liquid chamber 11, the liquid supply port 10, and the flow path 8. Also in the fifth embodiment, the flow path 8 connected to the pressure chamber 9 extends in a direction oblique to the arrangement direction of the discharge port arrays along the surface on which the discharge port arrays are formed.

  In the recording head 19 ″ ″ of the present embodiment, two flow paths 8 are connected to the pressure chamber 9, and these two flow paths 8 are on one side in the arrangement direction Y of the ejection port array in the pressure chamber 9. Only connected. The two flow paths 8 connected to the pressure chamber 9 are each formed with an acute angle. Further, the two flow paths 8 connected to the liquid chamber 11 are also connected to only one side in the arrangement direction Y of the discharge port array in the liquid chamber 11. The two flow paths 8 connected to the liquid chamber 11 are also formed so as to form an acute angle.

  In the present embodiment, when only the positions of the discharge ports 7 are compared, the discharge port arrays are arranged so that there is no pitch shift between the discharge ports 7 between the respective discharge port arrays. Further, when the positions of the two pressure chambers 9 connected to the same liquid chamber 11 are compared, the pressure chambers 9 are shifted from each other by one pitch, and the respective discharge ports 7 are arranged. Thus, in order to form the pressure chambers continuously arranged via the flow path 8 so as to be shifted by one pitch, each flow path 8 connected to the liquid chamber 11 has one flow path 8. And the other flow path 8 are formed to have different lengths. Among the pressure chambers 9 connected to the same liquid chamber 11, the length of the flow path 8 toward one pressure chamber 9 is different from the length of the flow path 8 toward the other pressure chamber 9. The pressure chamber 9 is close to the liquid chamber 11, and one pressure chamber 9 is separated from the liquid chamber 11. Since the pressure chambers 9 are connected to the respective pressure chambers 9 by the flow paths 8 having different lengths from the same liquid chamber in this way, the pressure chambers 9 along the arrangement direction Y of the discharge port arrays are connected between these pressure chambers 9. The position of is different. For example, when comparing the lengths of two flow paths connected to the same liquid chamber 9g, the length of the flow path 8n is longer than the length of the flow path 8m.

  Since the recording head 19 ″ ″ ″ is formed in this manner, the length of the flow path 8 can be increased without changing the length along the X direction in the recording head 19 ″ ″ ″. As a result, the ink flow resistance in the flow path 8 can be increased, the ink ejection efficiency from the ejection port 7 can be improved, and the increase in size of the recording head 19 ″ ″ can be suppressed. it can. Further, since the length of the flow path 8 can be increased, the length of the flow path 8 can be adjusted in order to adjust the resistance of the flow path 8, and the width in the design of the recording head 19 '' '' Can be spread. Further, since the length of the flow path 8 can be increased, when the ink around the discharge port 7 is thickened and the components contained in the ink are concentrated, the concentrated ink is supplied to the liquid chamber 11 or the liquid supply. Before diffusing to the mouth 10, it can be easily discharged outside the recording head 19 ″ ″. Accordingly, it is possible to suppress the occurrence of density unevenness in the recorded image due to the ejection of the concentrated ink when the ink is ejected, and the quality of the recorded image can be improved.

  In the present embodiment, two flow paths 8 having different lengths are connected to one pressure chamber 9. Therefore, the magnitude of the flow resistance to the ink when the ink passes through the flow path 8 is different between the flow paths 8. In general, as the flow path becomes longer, the flow resistance to the ink when the ink flows increases. However, the flow rate of the ink when the ink is refilled into the pressure chamber 9 after the ink is discharged becomes slower, and the refill flow is reduced. The time will be longer. On the other hand, when the flow path 8 is shortened, the flow resistance to the ink is reduced, and the time required for refilling is shortened. When the concentrated ink is prevented from diffusing into the liquid chamber 11 and the liquid supply port 10 and the long flow path 8 is secured to obtain a high-quality image, and the flow path 8 is shortened to shorten the refill time. As in the present embodiment, it is possible to adopt an eclectic structure.

  Further, in the recording head 19 ″ ″ of the present embodiment, the two flow paths 8 connected to the pressure chamber 9 are not connected to positions facing each other, and neither of the two flow paths 8 is pressurized. The chamber 9 is connected to the end of the discharge port array in the arrangement direction Y. Further, the two flow paths 8 connected to the pressure chamber 9 are configured to intersect each other at an acute angle. Accordingly, a vortex is generated in the flow of ink supplied to the pressure chamber 9 for ink ejection. As a result, the defoaming positions of the bubbles in the pressure chamber 9 can be dispersed, and the load on the heating element 6 due to cavitation can be reduced. As a result, the durability of the recording head 19 ″ ″ ″ can be improved.

  In addition, the ink flow path connected to the pressure chamber 9 is bent at the liquid chamber 11 portion. Therefore, the continuously formed ink flow path is bent at the portion of the liquid chamber 11, and the pressure wave generated in one pressure chamber 9 can be prevented from propagating to the other pressure chamber 9. The pressure wave can suppress the ink ejection from the other pressure chambers 9, and the quality of the recorded image can be improved.

  In the recording head 19 ″ ″ ″ of the present embodiment, the two pressure chambers connected to the same liquid chamber 11 via the flow path 8 are arranged at positions relatively apart from each other. These two pressure chambers 11 are arranged in different discharge port arrays and are shifted by one pitch in the discharge port array along the arrangement direction Y of the discharge port arrays. Therefore, if a change in flow rate occurs due to dust clogging or the like in one liquid supply port 10, the discharge ports affected by the discharge are relatively separated from each other. Since the affected discharge ports 7 are not concentrated in one place, the influence of the liquid supply port 10 in which the flow rate has changed is hardly visible in the recorded image. Therefore, even if a change occurs in the flow rate of the ink flowing through one liquid supply port 10, it is possible to suppress the influence on the recorded image due to the change.

  In the present embodiment, when only the positions of the discharge ports 7 are compared between adjacent discharge port arrays, there is no pitch deviation along the array direction Y of the discharge port arrays (Py ′ = 0). Although configured, the present invention is not limited to this. The recording head 19 ″ ″ ″ may have a configuration in which there is a displacement in the position of the ejection port 7 between the respective ejection port arrays. The displacement of the positions of the ejection ports 7 along the arrangement direction Y of the ejection port arrays between the adjacent ejection port arrays may be, for example, a pitch deviation Py ′ = 1/1200 inch. Further, in order to smoothly discharge bubbles from the pressure chamber 9, the shape of the pressure chamber 9 may be formed such that corners are gently formed at portions other than the position where the flow path 8 is connected to the pressure chamber 9.

  Further, the number of the flow paths 8 connected to the pressure chamber 9 is not limited, and one or two or more flow paths 8 are possible.

  In the present specification, “recording” is used not only for forming significant information such as characters and graphics but also for any case. It also represents the case where images, patterns, patterns, etc. are widely formed on a recording medium, or the recording medium is processed, regardless of whether it is manifested so that it can be perceived by human eyes. And

  The “recording device” includes a device having a printing function such as a printer, a printer multifunction device, a copying machine, and a facsimile device, and a manufacturing device that manufactures an article using an ink jet technique.

  “Recording medium” means not only paper used in general recording apparatuses but also a wide range of materials that can accept ink, such as cloth, plastic film, metal plate, glass, ceramics, wood, leather, etc. Shall.

  Furthermore, “ink” (sometimes referred to as “liquid”) should be interpreted widely as in the definition of “recording”. By being applied on the recording medium, it can be used for formation of images, patterns, patterns, etc., processing of the recording medium, or ink processing (for example, solidification or insolubilization of the colorant in the ink applied to the recording medium). It shall represent a liquid.

7 Discharge port 8 Flow path 9 Pressure chamber 10 Liquid supply port 11 Liquid chamber

Claims (12)

A plurality of pressure chambers provided with an energy generating element for applying energy to the liquid, and communicating with a discharge port for discharging the liquid to which energy is applied by the energy generating element;
A liquid supply port for supplying liquid to the pressure chamber;
A liquid channel that is connected between the pressure chamber and the liquid supply port and guides liquid from the liquid supply port to the pressure chamber;
In a liquid discharge head in which a plurality of discharge ports arranged in a first direction and a liquid supply port row in which a plurality of liquid supply ports are arranged are arranged in parallel.
The pressure chamber is communicated through two of said liquid supply port and two of said liquid flow path excluding said liquid supply port which is disposed closest to the pressure chamber,
Each of the two liquid flow paths connected to the pressure chamber is connected at an opposing position in the pressure chamber . The liquid ejection head according to claim 1 , wherein the pressure chambers and the liquid supply ports are alternately arranged via the liquid flow path. A plurality of pressure chambers provided with an energy generating element for applying energy to the liquid, and communicating with a discharge port for discharging the liquid to which energy is applied by the energy generating element;
A liquid supply port for supplying liquid to the pressure chamber;
A liquid channel that is connected between the pressure chamber and the liquid supply port and guides liquid from the liquid supply port to the pressure chamber;
In a liquid discharge head in which a plurality of discharge ports arranged in a first direction and a liquid supply port row in which a plurality of liquid supply ports are arranged are arranged in parallel.
The pressure chamber communicates with the two liquid supply ports excluding the liquid supply port arranged closest to the pressure chamber via the two liquid flow paths,
Each of the two liquid flow paths connected to the pressure chamber is connected so that an angle formed between the liquid flow paths is an acute angle, and each of the two liquid flow paths is one of the first directions in the pressure chamber. A liquid discharge head connected at an end. A plurality of pressure chambers provided with an energy generating element for applying energy to the liquid, and communicating with a discharge port for discharging the liquid to which energy is applied by the energy generating element;
A liquid supply port for supplying liquid to the pressure chamber;
A liquid channel that is connected between the pressure chamber and the liquid supply port and guides liquid from the liquid supply port to the pressure chamber;
In a liquid discharge head in which a plurality of discharge ports arranged in a first direction and a liquid supply port row in which a plurality of liquid supply ports are arranged are arranged in parallel.
The pressure chamber communicates with the two liquid supply ports excluding the liquid supply port arranged closest to the pressure chamber via the two liquid flow paths,
Each of the two liquid flow paths connected to the pressure chamber is connected so that an angle formed by the liquid flow paths is an acute angle,
The pressure chambers and the liquid supply port are alternately arranged via the liquid channel,
Each of the two liquid flow paths connected to the liquid supply port is connected so that an angle formed between the liquid flow paths is an acute angle. A plurality of pressure chambers provided with an energy generating element for applying energy to the liquid, and communicating with a discharge port for discharging the liquid to which energy is applied by the energy generating element;
A liquid supply port for supplying liquid to the pressure chamber;
A liquid channel that is connected between the pressure chamber and the liquid supply port and guides liquid from the liquid supply port to the pressure chamber;
In a liquid discharge head in which a plurality of discharge ports arranged in a first direction and a liquid supply port row in which a plurality of liquid supply ports are arranged are arranged in parallel.
The pressure chamber communicates with the two liquid supply ports excluding the liquid supply port arranged closest to the pressure chamber via the two liquid flow paths,
Each of the two liquid flow paths connected to the pressure chamber is connected so that an angle formed between the liquid flow paths is an obtuse angle. Each of the two liquid flow paths connected to the pressure chamber is connected at one end in a second direction intersecting the first direction in the pressure chamber. Item 6. The liquid discharge head according to Item 5 . Two liquid flow paths are connected to the liquid supply port,
Wherein the pressure chamber and the liquid supply port, the liquid discharge head according to claim 5 or 6, characterized in that are arranged alternately through the liquid flow path. A plurality of pressure chambers provided with an energy generating element for applying energy to the liquid, and communicating with a discharge port for discharging the liquid to which energy is applied by the energy generating element;
A liquid supply port for supplying liquid to the pressure chamber;
A liquid channel that is connected between the pressure chamber and the liquid supply port and guides liquid from the liquid supply port to the pressure chamber;
In a liquid discharge head in which a plurality of discharge ports arranged in a first direction and a liquid supply port row in which a plurality of liquid supply ports are arranged are arranged in parallel.
The pressure chamber communicates with the two liquid supply ports excluding the liquid supply port arranged closest to the pressure chamber via the two liquid flow paths,
Each of the two liquid flow paths connected to the pressure chamber is connected at an opposing position in the pressure chamber,
Two liquid flow paths are connected to the liquid supply port,
The pressure chambers and the liquid supply port are alternately arranged via the liquid channel,
Each of the two liquid flow paths connected to the liquid supply port is connected so that an angle formed between the liquid flow paths is an acute angle. A plurality of pressure chambers provided with an energy generating element for applying energy to the liquid, and communicating with a discharge port for discharging the liquid to which energy is applied by the energy generating element;
A liquid supply port for supplying liquid to the pressure chamber;
A liquid channel that is connected between the pressure chamber and the liquid supply port and guides liquid from the liquid supply port to the pressure chamber;
In a liquid discharge head in which a plurality of discharge ports arranged in a first direction and a liquid supply port row in which a plurality of liquid supply ports are arranged are arranged in parallel.
The pressure chamber communicates with the two liquid supply ports excluding the liquid supply port arranged closest to the pressure chamber via the two liquid flow paths,
A plurality of the discharge port arrays are arranged,
The two pressure chambers connected to the same liquid supply port via the flow path are included in the adjacent discharge port arrays, respectively.
The liquid discharge head, wherein the two pressure chambers are arranged along the first direction so as to be shifted from each other by one pitch which is an interval between the discharge ports arranged in the discharge port array. . A plurality of pressure chambers provided with an energy generating element for applying energy to the liquid, and communicating with a discharge port for discharging the liquid to which energy is applied by the energy generating element;
A liquid supply port for supplying liquid to the pressure chamber;
A liquid channel that is connected between the pressure chamber and the liquid supply port and guides liquid from the liquid supply port to the pressure chamber;
In a liquid discharge head in which a plurality of discharge ports arranged in a first direction and a liquid supply port row in which a plurality of liquid supply ports are arranged are arranged in parallel.
The pressure chamber communicates with the two liquid supply ports excluding the liquid supply port arranged closest to the pressure chamber via the two liquid flow paths,
2. The liquid discharge head according to claim 1, wherein the two liquid flow paths connected to the pressure chamber have different lengths from each other. Said pressure chamber, said first liquid discharge head according to claim 1, any one of 10, characterized in that are arrayed along the direction. Wherein at least a portion of the wall defining the pressure chamber, the liquid discharge head according to any one of claims 1 to 11, characterized in that it is a curved surface.

Images